【摘 要】
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Laser cladding Ni-based composite coating was fabricated on the surface of 42CrMo steel by using 6 kW fiber laser. By the addition of Mo and WC powder, a well-formed and crack-free laser cladding comp
【机 构】
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School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R.
【出 处】
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第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
Laser cladding Ni-based composite coating was fabricated on the surface of 42CrMo steel by using 6 kW fiber laser. By the addition of Mo and WC powder, a well-formed and crack-free laser cladding composite coating were obtained. The morphology, composition, microhardness and wear resistance of composite coatings were studied by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), microhardness tester and wear tester. The results show that the cladding layer has metallurgical bonding with the substrate. The main phases of composite coating are (Ni, Fe),Fe6W6C,Cr7C3,Mo2FeB2,CrB, WC. After the addition of Mo powder, the size of the microstructure of composite coatings is fine. WC particles partially dissolve and react with other elements to form eutectics, which exist in the shape of block and grain. Stubby rod carbides are appeared in the interdendritic interface. The molybden m and chromium are rich at the grain boundaries. The distribution of hardness is uniform in Ni-based cladding layer, and its microhardness is significantly higher than the substrate. Its wear resistance reaches 15.3 times of 42CrMo steel.
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